Sprayer construction



Patented Aug. 1, 1933 1,920,636 SPRAYER CONSTRUCTION Nicholas W. DeFrees, Hastings, Minn., assignor to H. D. Hudson Manufacturing Company,Chicago, Ill., a Corporation of Minnesota 4 Application February 18,1931. Serial No. 516,676v I 9 Claims. (01121-77) This invention relatesto improvements in sprayers of the type in which a pump unit isremovably mounted in a tank, with the piston or pump rod extendingoutwardly from the end of the cylinder and tank, and having a gripthereon for operating it. In devices of this kind, the pump rod grip andthe pump rod serve as means for carrying the tank.

In this art, it has long been the practice to provide a tank andcylinder capping elements co-operating with means attached to the tankwall, for clamping the cylinder, in sealed relation to an opening in thetank wall. It has, moreover, been the practice to threadingly connectthe cap to a tubular extension of the tank wall, but this latterpractice involves considerableexpense, not allowable in a, highlycompetitive market. It has also been the practice to rivet an annulus tothe outer side of the top wall of the tank and to provide the annuluswith inclined surfaces simulating a single thread, with which surfacescorresponding surfaces of the cap engage, so that when the cap isrotated a wedging action results, whereby, due to reaction betweenannulus and tank wall, the cap is pressed against the cylinder, causingsaid cylinder to sealingly close the tank opening, so that fluid leakageis prevented during pumping action. This old practice puts considerablestrain on the tank wall,

tending to loosen the rivets, and makes it difficult to maintainpressurein the tank because-of leakage. The annulus is formed of sheet metal,

and this is a cheap construction, but, due to ing the cylinder directlysupported by the ring,

instead of by the tank wall. In this way, the

wedging reaction is taken entirely by the ring,

and not at all by-the tank.

Features include: the supporting of the cylinder, cap, and wedging meansdirectly by an annuluswhich is formed from one piece of metal; thespecific construction of the annulus. the formation of a bead on the rimof the cylinder which engages a gasket in a'manner to squeeze it indirections axially of the tank and cylinder,

as well as radially inwardly toward the cylinder wall; to providecircumferential stifi'ening portions on the ring, between the wedgingsurfaces; and to provide an annular depression .in the ring which acts both'to set the gasket, and to center after downward motion andengagement with the annulus, it is positioned to be clampingly engagedby a rotative motion; and Figure 3 is a plansectionon line 3-3 of Figur1, showing the cap in operative clamping posi tion.

Numeral-1 indicates the tank having an upper outwardly curved wall 2,said .wall having. an opening 3 therein. Theannulus generally indicatedat 5 is very cheaply formed from a single piece of sheet metal and isprovided with a vdepressed central portion 6 forming a shoulder '7 whichengages snugly in the -opening-3,centering the annulus, and also.forming a depression 8 extending downwardly'from its upperside toreceive a gasket 9. The depressed portion 6 has an opening 10 andthrough this opening the cylinder 11 passes downwardly into the tank.The cylinder has a cross-sectionally arcuatecircumferential rim bead 15,engaging the top of the gasket as-shown. This is a feature. It will benoted that the lower'surface of this bead is concave and that whenpressure is appliedto. the bead by the cap, the gasket material isforced downwardly and pulled inwardly and jammed against the outerperiphery of the cylinder and positionedito seal the cylinder-receivingopening 10 of the annulus. The depressed'portion 6 acts as a centeringelement vfor the annulus, and rivets 16 pass through the outer lowerwall portion 17 and throughthe wall 2. The annulus has an upstandingwall stiffening portion 18. The wall is formed to providecircumferentially spaced elements, three in numbenand the tops of theseelements are turned over, as at 20 to form helices or'cam surfaces, thesurfaces being spaced from one another and being 3 slanted downwardlyinlclockwise direction, as the threads, of a right-hand screw. Betweenthe threadforrning flanges 20, the upstanding wall portion 18 is cutslightly away as shown but is so cut as to leave reinforcing orstiffening portions23 between each flange 20, which portions are, of vcourse, continuous with the wall 18. This is also a feature of theinvention which makes the annulus much more resistant to deformation,which might result from the wedging action of the elements. a

The cap in this instance is in the form of a casting, and provides threeprojecting portions 25, which'are of less circumferential extent thanwardlyin clockwise direction, and when the cap has been moved to bringthe portion below the flanges 20, and on rotation to the right,theseelements 25 assume wedging relation with the inclined flange portions20, as shown in Figures 1 and 3, and pressure is applied to beaded rim 15, and the gasket sealingly. compressed,. as shown. I

The provision of a continuous wall 18 is a fea-' ture of the invention,and it will be noted that the upper edge of the portions 23 of the wallare substantially flush with the under side of the cam surfaces 20. Thiscontinuous upstanding wall 18 facilitates the filling of the tank,serving the part of a funnel. This enables the cam surfaces to beproperly shaped without the' use of a support at the inside surfaces,which use would necessarily greatly increase thecost of production. Thearrangement also permits a shorter length of carn surface projection,greatly adding to the strength, and decreasing the probability of themetal drawing out of shape during the forming operation.

The top of the cap is provided with a hollow wrench projection by whichthe cap can be rotated to'perform its wedging action. The cap has anopening 31, through which the pump or cylinder rod 32 passes. Theextension 30 has at its top a, central opening 33, and diametricallyarranged recesses 35 extending outwardly from and intersecting theopening 33 and the nut also provides shoulders 36-3'7 lying outwardlybeyond and intersecting the opening. The pump rod has a, handle as anextension of a cylindrical portion 39, in threaded connection with rod32.

This cylindrical portion has lugs 38 diametrically 50 arranged'andadapted to enter the recesses 35, as shown in Figure 3, and to engagethe shoulders 36 37 when rotated in counter-clockwise direction. Whenthe lugs are engaged with the shoulders and when the pump rod isslightly withdrawnjthelugs 38 move upwardly into diametrically arrangedpockets 40 inthe manner shown in dotted lines in Figure 2 so that thetank, now connected with the cap through the threads, cannot rotatetolbring the lugs into registration with recesses'35, as shown inFigure3, which would result in the tank dropping downwardly.

Another ,ieature of the invention relates to the arrangementofthehelix-forming segments, and the relation of the bend-lines ofthesesegmental portions to the upper un-bent edges of the inter veni-ngportions of the upright wall of the cuplike annulus. "The bend lines ofthe segmental flanges slant generally in the same direction at angles toa horizontal plane. The upper edges of the un-bent intervening wallportions'23 are 'slanted'in a direction opposite to that of the bendlines of the helix-forming flanges, and it will be noted that the endsof the bend lines of the flanges substantially intersect or arecoincident or at the same level or in the same plane with thecorresponding ends of these edges. The upper edge, including thehelix-formingportions, is, before the bending operation. so arrangedthat the line of bend is determined by the junction points. a In thedrawing, the junction points have been indicated by the numerals 2il -2eand the upper edge has been indicated by the numeral.

20. The bend line is indicated 29 This is a valuable feature of theinvention. The ends ofv the bend lines intersect the ends of the topedges 29*. at points ZO -ZO I. In thisway, the portions 23 reinforce thehelix-forming sections or flanges 20 at the bend or helix line, duringand after bending. A forming die applies pressure to the upstandingsections 26, and moves the sections downwardly and inwardly along thebend line established or defined between points 20 -20 In any differentstructure, as where the top edges of the inter-helix stifiening wallportions 23, do

not intersect at points which correspond to the ends of th helix bendline, the proper points of support are not established, so thatdie-forming cannot be accomplished without arranging a is atroublesome'and'tirneconsuming operation;

The present invention, therefore, provides a structure which can beproperly formed, without the use of an internal core of matrix die, thusmaterially reducing production costs;

I claim asrny invention:

l. A device of the class described comprising a tank, having an opening,an annulus having a wall engaging the tank wall and overlying theopening, that part of. the annulus" wall which overlies the tankopening'h'aving an opening, a gasket surrounding the annulus opening, 2.cylinder passing through the gasket and annulus opening and having aflange engaging the gasket, a piston rod for the cylinder, a captraversedby the piston rod,'said annulus and cap having means cooperableto cause said cap to press the flange against the gasket when the cap isro' tated', means by which rotation of the rod rotates the cap, andmeans sealingly securing the tank wall-engaging portion of said annuluswall to said wall. j

2. A device of the class described comprising a tank having an opening,anannulus engaging flange engaging the gasket, a piston rod for the.

cylinder, a cap traversed by the piston rod, said annulus and caphaving; means cooperable to cause said cap to press the flange againstthe gasket, and means oncap and rod cooperableto; cause the cap to pressthe flange against the gasket. 7 a

3-. A device of the class described comprising a tank having an openingin its top wall, an-annulus and means securing it to the outer side ofthe top wall, said annulus having a wall portion overyling the top walland opening and havingan opening in that wall portionwhich overlies thetank opening, a gasket engaging the annulus and surrounding the annulusopening, acylinder extending through gasket and annulus opening, andhaving a bead engaging the gasket, a piston rod for the cylinder, a captraversed by the piston rod, said annulus and cap having helical meanswedgingly cooperable to cause the cap to press thebead against thegasket when the cap is rotated, whereby the wedging strains are takenonly by the annulus member and none transmitted to the tank wall, andmeans on the cap and rod cooperable to cause the cap to press the beadagainst the gasket.

4. A device of the class described comprising a tank having an opening,an annulus having a wall engaging the tank wall and overlying theopening, said annulus having a pressed-out portion which enters theopening to center the annulus and to provide a depression at the outerside of the annulus, said pressed-out portion having an opening, agasket supported by the pressedout portion and surrounding the annulusopening, a cylinder passing through the gasket and annulus opening, andhaving. a flange engaging the gasket, a piston rod for the cylinder, acap traversed by the piston rod, said annulus and cap having meanscooperable to cause-said cap to press the flange against the gasket,means on cap and rod cooperable to cause the cap to press the flangeagainst the gasket and means securing said annulus to said tank wall.

5. A device of the class described comprising a tank having an opening,an annular singlepiece cup-like stamped metal member having a bottomwall and a circumferentially continuous side wall and adapted to act asa filling funnel for the tank and secured to the outer surface of thetank about the opening, a gasket supported by the bottom wall of themember, a cylinder pass ing through the gasket, bottom wall of themember, and through the tank opening, and having a flange engaging thegasket, a piston rod for the cylinder, a cap traversed by the pistonrod, the rim of the circumferential continuous side wall of the memberhaving inwardly-bent, horizontally-disposed spaced helix-formingflanges, said cap having means cooperable with said flanges to press thecylinder flange against the gasket when the cap is rotated, and means onthe cap and rod cooperable to cause the cap to press the flange againstthe gasket.

6. A device of the class described comprising a tank having an opening,a cup-like annulus having a bottom wall the outer portion of whichsealingly engages the outer surface of a tank wall, said bottom wallhaving a shallow centrally depressed portion forming a sealing shoulderfitting the opening of the tank, the depressed portion having therein anopening of less area than the depressed portion, the upstandingcircumscribing wall portion of said cup-like annulus having at its upperedge a series of in-turned bent-over segmental portions overlying thebottom wall of the annulus but not overlying the opening of thedepression, the lower surfaces of the segmental portions and the bendlines being slanted in one direction to cooperate to form a helix, theupper edges of the un-bent intervening wall portions being slanted in anopposite direction, and the ends of the bend lines at the junctionpoints with said slanted edges being substantially in the same planewith the ends of said edges, a gasket support-ed by the depressedportion and circumscribing the opening of said depressed portion, acylinder passing through the gasket and annulus opening and having aflange engaging the gasket, a piston rod for the cylinder,

a cap traversed by the piston rod, said cap-haw ing means cooperablewith said segmental portions to cause the cap to press the flangeagainst the gasket when the cap is rotated and means by which rotationof the rod rotates the cap.

'7. A device of the class described comprising a tank having a top wallhaving anopening therein, an annular elementcircumscribing the openingand having a bottom wall which circumscribes the opening and sealinglyengages the top surface or" the top wall of the tank at a pointoutwardly beyond the opening, said bottom wall having a shallowdepressed wall portion within and cooperating with the opening to form aseal a and acting as a centering and gasket-pocketing means, a gasket insaid pocket, said depressed wall portion having an opening which thegasket circumscribes, a cylinder traversing the last mention-ed openingand having a flange which engages over the washer, a cap and meanscarried by the annulus and cap cooperative on rotation of the cap topress thecylinder flange against the gasket, a piston rod for thecylinder and means on cap and rod cooperable to rotate the cap to causeit to press the cylinder flange against ends of the upper edges of theun-bent intervening upstanding wall portions and ends of the bend linesof the segmental portion being substantially in the same plane at thejunction points, the

bottom wall of said annulus being engaged with the tank wall and havinga portion overlying the tank opening, a gasket surrounding thev annulusopening, a cylinder passing through the gasket and annulus opening andhaving a flange'engaging the gasket, a piston rod for the cylinder, acap traversed by the piston rod, said cap having means cooperable withthe segmental portions to cause the cap to press the flange against thegasket when the cap is rotated and means on cap and rod cooperable tocause the cap to press the flange against the gasket.

9. A device of the class described comprising a tank having 'a'top wallhaving an opening therein, an annular element of sheet metalcircumscribing the opening'and having a bottom wall which sealinglyengages the top surface'of the top wall of the tank at a point outwardlybeyond the opening, said bottom wall having a shallow depressed portionwithin and cooperating with the edges of the opening to form anadditional seal and acting as a centering and gasket-pocketing means, agasket in said depressed'wall portion, said portion havingan openingwhich the gasket circumscribes, a cylinder traversing: the lastmentioned opening and having a flange which engages over the gasket,acap, means carried by the annulus and cap, cooperative on rotation ofthe cap to press the cylinder flange against the gasket, a piston forthe cylinder having a rod traversing the cap and means carried by thecap and rod for rotating the cap by the piston,

NICHOLAS W. DE FREES.

